{"id":171318,"date":"2023-06-05T07:06:07","date_gmt":"2023-06-05T07:06:07","guid":{"rendered":"\/knowledge\/forums\/topic\/when-using-the-adjoint-solver-can-i-define-an-observable-on-an-interior-face-and-if-not-is-there-a-workaround\/"},"modified":"2023-07-31T12:30:20","modified_gmt":"2023-07-31T12:30:20","slug":"when-using-the-adjoint-solver-can-i-define-an-observable-on-an-interior-face-and-if-not-is-there-a-workaround","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/when-using-the-adjoint-solver-can-i-define-an-observable-on-an-interior-face-and-if-not-is-there-a-workaround\/","title":{"rendered":"When using the Adjoint solver, can I define an Observable on an interior face and if not is there a workaround?"},"content":{"rendered":"

You may want to define an Observable on an interior face, for example, total pressure on an interior face. Using Observable type surface-integral will not allow interior faces to be selected since interior faces will not be listed. Therefore, it is not possible to define an Observable using an interior face. However, there are two workarounds: 1. The Observable type volume-integral can be used, where it will be possible to either select cell zones or define a box to select cells close to the interior face. 2. For Fluent 18.2 and above the Observable type surface-integral can be used with iso-surfaces and iso-clips. You can use the iso-clip of the complete range of mesh coordinates for an interior zone to use the location of an interior as Observable.<\/p>\n","protected":false},"template":"","class_list":["post-171318","topic","type-topic","status-publish","hentry","topic-tag-18-2","topic-tag-adjoint-solvers","topic-tag-fluent","topic-tag-fluent-flow-optimization","topic-tag-fluid-dynamics","topic-tag-optimization"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t